Dipper tooth



Patented Dec. 23, 1947 I DIPPER TOOTH George W. Mark, South Milwaukee, Wis., assignor to Bucyrus-Erle Company, South Milwaukee, Wis., a corporation of Delaware Continuation of: application Serial No. 513,675;

filed December 10, 1943. This application filed November 29, 1945, Serial No. 631,603

My invention relates to new and useful improvements in dipper teeth for excavating dippers, and more particularly to teeth which comprise a base which fits into a socket on the lip of the dipper, and a cap-shaped removable and renewable wearing tip,,whlch tip in turn comprises a relatively hard portion for doing the digging, and a relatively malleable portion for securing the tip to the base.

This is a continuation of my application, Serial No. 513,675, filed December 10, 1943, and since abandoned, for improvements in Dipper teeth.

It is the principal object of my invention to devise a base and tip such as to facilitate a snug and secure fit with the minimum of accurate machining, and such as to be readily attached and removed. 1

' In addition to my principal object, above stated, I have worked out a number of novel and useful details, which will be readily evident as the description progresses.

My invention consists in the novel parts and in the combination and arrangement thereof, which are defined in the appended claims, and of which one embodiment is exemplified in the accompanying drawings, which are hereinafter particularly described and explained.

Throughout the description the same reference number is applied to the same member or to similar members.

Figure lis a plan view of my base from below. Figure 2 is a side elevation of this same base. Figure 3 is a vertical section of this same base, taken along the lines 3-3 of Figure 3.

I Figure 4 is a, side elevation of my point. Figure 5 is a rear elevation of this same point, taken along the lines 55 of Figure 4.

Figure 6 is a section of the two parts of my tooth assembled, taken along the line 6-6 of Figure 7.

7 Claims. (01. 37-142) The side slopes of the portion II are shown at l5, IS in Figure 3.

The rear end iii of my base is shown hexagonal for insertion in a hexagonal hole in the dipperlip; but, of course, it could be any other shape to register with whatever other shape of hole was used, or it could attach in any other conventional manner.

, Turning now to Figures 4 and 5, we see that my tip comprises a rectangular slab I! of tool steel with beveled ends, and a box-like portion l8 of soft malleable metal welded thereto. When, in the claims, I refer to upper and lower portions, this is merely for the purpose of correlating the cooperating portions of base and tip, and does not imply what position my tool occupies during digging.

It will be readily seen that the slabs of tool steel can be cut from a sheet or fiat bar thereof, with absolutely no wastage, except sawdust.

My base is so forged or cast as to fit snugly, but not tightly, within the box l8 of my tip.

When the tip has been driven firmly onto the base, the rear lower edge I9 of box I8 of the tip is hammered over into recess I4 of the base, as

shown in Figures 6 and '7.

I realize that somewhat similar two-part teeth in the past have had one or more rearwardly Figure 7 is a side elevation of the two parts of M my tooth assembled.

Turning now to Figures 1, 2 and 3, we see that the tooth base there portrayed has a fiat truncated rectangular pyramidal portion H pro- However this slight change of slope exists merely to protect the shank, and is not essential to my present invention. What is essential is the rear shoulder of portion II, which shoulder need not (although it preferably should) extend clear across the tooth.

projecting tongues on the tip, to be hammered into a corresponding recess or corresponding recesses on the base. I have tried this and found that it is not practical, for the reason that the unsupported tongue is not strong enough to hold the tip in place, even if the tongue be widened to extend practically clear across the base. The tongue either breaks off; or, if it does not, it can too easily straighten out and thus loosen the tip from the base. I

But, by bending a portion of the continuous rear edge of the box l8 into the recess on the base, I have found that the two corner edges of this box constitute two "beams to support the bent portion of the rear edge, and furthermore that the sinuous conformation of the bend (which would not exist with a simple tongue, no matter how wide) renders unbending enough more diflicult than would be the unbending of a tongue, so that my tooth does not tend to work loose. Still furthermore, due to the rigidity of the two beams, the bending of the rear edge of the box into place, stretches this rear edge; and

.hence unbending would require compression of Having now described and illustratedonetum otmyinventiomlwlshittobeunderstoodthat myinventionisnottobelimitedtothespedfle 'tormontotpartshereindesm'lbed andshown. Ielaim: 1. Inatwo-piece dipper tooth, the

shaped tip. the former having a. rearward-facing shoulder on the lower face of the wedge, and the latter comprising an upper hand portion and a. lower malleable portion, which malleable portionoomprises abottomsection andtwoside sectlons,thebottomsectionandatleasttheadjaeentpartofthesideseetionsextendlngbeyond the outer edge of the shoulder, and this extendingpartoithebottomsectionbeingcapableoi -otawedge-shapedbaseandaeoopera tingeapbeingbentovertheshouldertoseeurethetwopieces removably together, whereupon the jum side sections extending beyond the outer edge of theshoulder,andthisextendingpartoi'fl1ehottomsectionbeingeapableofbeingbentoverthe shmzldertoseeurethetwopieeesremovlblytogether, whereupon the junewres between the bottom section and the two side sections serve tobracethethusbentpartotthehottmnseoflm.

3.Adipper-toothtoelaim2,fmfl1c eharaeterizedlvy thefaetthatthefrmtlowa' portionofthew e-shapedbaseisaflattnmcated mamiitherearslopeot whiehiormstheshonlder.

LAdipper-toothlceordingtoelaimZfimther eharaeterinedhythefactthatthefrontlower portlonoftheiflk -fi pedbaseisaflattruncatedreetangnlarpyramidandthatthelower ilceofthewedzejustbeynndthlspyramidhas anlnereuedslomthusiomnngareeessbetween the yramidandthisslope.

5.Adipper -toothlccordmgtoelaim1,eharacterizedbythehetthntthe shoulder-extends transverselyclearacrossthebase.

6.'Adipper-toothaccordingtoclaim2,eharacterlzedbythefactthattheshoulder-extends transverselyelear acrossthebase, amlthat the lower edges'of the base ahead of this shoulder are sloped.

7.Adimer-toothaccordingtoclaim2,char- 'acterizedby thefaetthnt the rear edge of the upper hard digging portion projects above the surface of the base. whereby the sealing contact of the rear edge of the malleable portion with thebaseeanbehwokenbyhammeringonthe rear ed of the hard dissin p rtion.

GEORGE w; MORK.

REFERENCES CITE] The following references are of record in the iile of this patent:

STATES PATENTS Number Name Date 1,270,610 Stone June 25, 1918 1,7015% Herrlsm Apr. 2, 1929 2,238,081 Apr. 15, 1941 2,259,456 Crawford Oct. 21, 1941 2,,653 Ward Dec. 22, 1942 

